A firm will measure its value added as the difference between its SALES REVENUE and the COST of its bought-in materials and services. Where a firm operates at only one level of production or distribution in a VALUE-ADDED CHAIN, it will generally add less value than a vertically integrated firm which embraces several production and distribution stages. See VALUE CREATED MODEL, CONSUMER SURPLUS, VERTICAL INTEGRATION, VALUE-ADDED TAX, VALUE-ADDED STATEMENT, VALUE ADDED PER EMPLOYEE, PROFIT AND LOSS ACCOUNT, ECONOMIC VALUE ADDED.